On 12/15/16 17:45, Christoph Hellwig wrote: > On Thu, Dec 15, 2016 at 10:33:47AM +0900, Damien Le Moal wrote: >> For a regular block device, I agree. But in Stephan case, I think that >> the check really needs to be against the physical block size, with the >> added condition that the bdev is a DASD device (similarly to the zone >> alignment check for zoned block devices). > > Then they need to expose a chunk_size. physical block size is defined > as not having a meaning for the kernel. Or create the block device with the logical block size set to the physical sector size. Which would be even more simple and in fact correct in this case since only physically aligned accesses make sense for DASD. -- Damien Le Moal, Ph.D. Sr. Manager, System Software Research Group, Western Digital Corporation Damien.LeMoal@xxxxxxx (+81) 0466-98-3593 (ext. 513593) 1 kirihara-cho, Fujisawa, Kanagawa, 252-0888 Japan www.wdc.com, www.hgst.com -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
